REMEMBER!!!! Flashcards
What is the tests for sulfur dioxide?
Add potassium permanganate paper
(if present, it will turn from purple to colourless)
What is the test for ammonia?
Add damp litmus paper (turns blue if ammonia is present)
What is the test for carbon dioxide?
Bubble the gas through limewater (if present, white precipitate forms)
What is the test for chlorine?
Add damp blue litmus paper (if chlorine is present, it will turn red)
What is the test for hydrogen?
Add a lit splint (produces a squeaky pop and goes out if hydrogen is present)
What is the test for oxygen?
Add a glowing splint (blow it out) - (if oxygen present, it will relight)
How identify positive ions? (metals)
- Add sodium hydroxide (insoluble)
- Flame test
Flame test positive result for barium?
light green
Flame test positive result for calcium?
orange-red
Flame test positive result for copper (II)
blue-green
Flame test positive result for lithium?
red
Flame test positive result for potassium?
lilac
Flame test positive result for sodium?
yellow
How to test for carbonates?
bubble through limewater. dilute acids added to carbonate should fizz and produce CO2
How to test for halides?
Add dilute nitric acid, then silver nitrate.
- If a precipitate forms, a halide ion is present
white = chloride
bromide = cream
iodide = yellow
**more down group 7, the more off white it goes)
